Such as?
We hear that charge all the time. Some specifics would be nice.
Baptism/No Baptism
Saved by faith(all are called)/Predestination
Soul with God upon death/Soul sleeps until judgement day
Rapture/No Rapture
Bodily Resurrection/No bodily Resurrection
Just to name a few.
But, I am sure that these are not new or unknown to most Protestants.
The fact that there is even one major difference regarding salvation shows that there is no authority on Christianity outside the church.